http://www.gurock.com/smartinspect/using-custom-protocols-with-the-smartinspect-libraries.a.html

MailProtocol.cs

using System;
using System.Net.Mail;
using Gurock.SmartInspect;

public class MailProtocol: Gurock.SmartInspect.Protocol
{
	private string fHost;
	private int fPort;
	private string fTo;
	private string fFrom;
	private SmtpClient fClient;

	protected override string Name
	{
		get { return "mail"; }
	}

	protected override bool IsValidOption(string name)
	{
		return
			name.Equals("host") ||    /* SMTP server host */
			name.Equals("port") ||    /* Port of SMTP server */
			name.Equals("to") ||      /* Receiver address */
			name.Equals("from") ||    /* Sender address */
			base.IsValidOption(name); /* Handle common options */
	}

	protected override void LoadOptions()
	{
		base.LoadOptions(); /* Load common options */
		this.fHost = GetStringOption("host", null);
		this.fPort = GetIntegerOption("port", 25);
		this.fTo = GetStringOption("to", null);
		this.fFrom = GetStringOption("from", null);
	}

	protected override void InternalConnect()
	{
		this.fClient = new SmtpClient(this.fHost, this.fPort);
	}

	private MailMessage FormatLogEntry(LogEntry logEntry)
	{
		MailMessage message = new MailMessage(this.fFrom, this.fTo);
		message.Subject = logEntry.Title;
		message.Body += logEntry.Level;
		message.Body += Environment.NewLine;
		message.Body += logEntry.Title;
		return message;
	}

	protected override void InternalWritePacket(Packet packet)
	{
		switch (packet.PacketType)
		{
			case PacketType.LogEntry:
			{
				MailMessage message = FormatLogEntry((LogEntry) packet);
				this.fClient.Send(message);
				break;
			}

			/* Other packet types can go here */
		}
	}

	protected override void InternalDisconnect()
	{
		this.fClient = null;
	}
}